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The presence of gill slits, in the embryos of all vertebrates, supports the theory of

1. biogenesis
2. recapitulation
3. metamorphosis
4. organic evolution

Correct answer: recapitulation

Solution

The presence of gill slits in vertebrate embryos is used as evidence for recapitulation, the idea that embryonic development repeats ancestral evolutionary stages. This supports the view that organisms show traces of their evolutionary past during development.

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